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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Journal of Engineering and Technological Sciences
Setio, Herlien Dwiarti
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering

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Perbandingan Metode Penskalaan Amplitudo dan Pencocokan Spektral terhadap Respons Non-Linear Jembatan Terisolasi dengan LRB: Studi Dampak pada Perilaku Histeresis dan Potensi Akumulasi Kerusakan LRB Nurdhyanti, Dinda Imas; Setio, Herlien Dwiarti
Jurnal Teknik Sipil Vol 32 No 2 (2025): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2025.32.2.9

Abstract

Abstrak Analisis Riwayat Waktu Non-Linear (NLTHA) merupakan metode yang efektif untuk merepresentasikan respons struktural akibat beban gempa secara akurat. Dalam analisis NLTHA, pemilihan metode modifikasi gerak tanah memiliki peran yang krusial, dimana secara umum terdapat dua metode yaitu penskalaan amplitudo dan pencocokan spektral. Data gerak tanah yang akan di modifikasi didapatkan berdasarkan hasil analisis deagregasi untuk wilayah Jakarta dengan periode ulang 1000 tahun. Penelitian ini bertujuan untuk membandingkan dampak pemilihan kedua metode modifikasi gerak tanah terhadap potensi kerusakan elemen non-linear berupa Lead Rubber Bearing (LRB) pada struktur berupa jembatan terisolasi seismik. Untuk tujuan ini, tujuh pasang rekaman gerak tanah diolah dengan penskalaan amplitudo yang mengacu pada standar NZS 1170.5-2004, sedangkan pencocokan spektral dilakukan menggunakan perangkat lunak SeismoMatch. Intensitas Arias (IA) merepresentasikan total energi input gempa yang terserap ke dalam sistem struktur, sehingga dari kedua metode akan dilakukan pengecekan terhadap IA. Dari hasil penelitian yang telah dilakukan, menunjukkan bahwa metode pencocokan spektral mencapai kecocokan yang superior terhadap target spektrum. Namun, metode ini mengubah profil akumulasi energi gempa rekaman gerak tanah asli, mengindikasikan terjadinya modifikasi distribusi energi input. Sebaliknya, penskalaan amplitudo berhasil mempertahankan IA yang identik dengan rekaman gerak tanah asli. IA berkorelasi kuat dengan potensi kerusakan kumulatif dan disipasi energi histeresis, sehingga penskalaan amplitudo dinilai lebih relevan untuk memprediksi akumulasi kerusakan LRB. Kata-kata Kunci: Jembatan Terisolasi, LRB, Pencocokan Spektral, Penskalaan Amplitudo, Perilaku Histeresis, Intensitas Arias, Respons Non-Linear. Abstract Nonlinear Time History Analysis (NLTHA) is an effective method for accurately representing structural response under seismic loading. In NLTHA, the selection of ground motion modification methods plays a crucial role, with two primary approaches commonly employed: amplitude scaling and spectral matching. The ground motion data to be modified were obtained based on deaggregation analysis for the Jakarta region with a 1000-year return period. This study aims to compare the impact of selecting these two ground motion modification methods on the potential damage of nonlinear elements, specifically Lead Rubber Bearing (LRB), in seismically isolated bridge structures. For this purpose, seven pairs of ground motion records were processed using amplitude scaling following the NZS 1170.5-2004 standard, while spectral matching was performed using SeismoMatch software. Arias Intensity (IA) represents the total seismic input energy absorbed into the structural system; therefore, IA was evaluated for both modification methods. The research results demonstrate that the spectral matching method achieves superior agreement with the target spectrum. However, this method alters the energy accumulation profile of the original ground motion records, indicating modification of the input energy distribution. Conversely, amplitude scaling successfully maintains IA identical to that of the original ground motion records. IA strongly correlates with cumulative damage potential and hysteretic energy dissipation; therefore, amplitude scaling is considered more relevant for predicting LRB damage accumulation. Keywords : Spectral Matching, Amplitude Scaling, Hysteretic Behavior, Arias Intensity, Non-Linear Response
Numerical and Experimental Study of Seismically Excited Scaled Structure with Active Mass Damper Setio, Herlien Dwiarti; Chen, Pei-ching; Setio, Sangriyadi; Sinjaya, Michael Felix; Andriana, Cecilia
Journal of Engineering and Technological Sciences Vol. 56 No. 5 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.5.6

Abstract

In recent years, the development and implementation of artificial intelligence (AI) have attracted tremendous attention. The implementation of active control systems for building structures can be improved by using an AI controller. Non-AI controllers such as the Linear Quadratic Regulator (LQR) controller require full state variables of the structure to be measured, which is rarely feasible. To address this problem, two AI models, namely, artificial neural network (ANN) and fuzzy logic (FL), have been tried as AI-based controller in various studies. In the present study, both AI models were investigated to see their practicality and effectiveness. The AI models were implemented to control an active mass damper (AMD) in a three-story prototype-sized building. The simulation results from the structure with an LQR controller were used as benchmark and training data for the AI models. The results of the study demonstrated that although both AI models could reduce the structure responses, ANN was more practical and effective compared to FL as an AI-based controller for the given structure. Furthermore, the effectiveness of an ANN-based AMD was also shown by the experimental results.
Pemodelan Numerik Aliran Angin di Sekitar Gedung Tinggi Menggunakan Metode RANS Standard K-ε dengan Program OpenFOAM Sanjaya, Yongky; Priambodo, Doni; Sarli, Prasanti Widyasih; Setio, Herlien Dwiarti; Syariefatunnisa, Syariefatunnisa
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1052.967 KB) | DOI: 10.14710/mkts.v28i1.37375

Abstract

Amplified wind loads around buildings could induce structural failure, thus making it important to understand the behavior of fluid flow between buildings. In this study, the analysis is performed using RANS, a computational fluid dynamics (CFD) simulation with faster computation time compared to other methods. OpenFOAM, an open-source software, is used to run the simulations. This study used a structured mesh with standard RANS k − ε turbulence model. Four symmetrical buildings with a scale of 1: 420 are used as the model of this study. Numerical modelling of different computational domain size and different degrees of fineness of the meshing is simulated to determine margin of errors. The result indicates that changes in computational domain has a significant effect on CFD analysis in lowering the error value in area with high flow speed ratio (U/U0> 1) to reach the acceptable error limit. Contrastingly, changes in the degree of fineness of the meshing do not give a significant change in error value. A relatively coarse meshing with fast computation time could give a similar result as A fine meshing model with longer computation time.
Permodelan Numerik Aliran Angin Pada Jalan Antara Bangunan Tinggi Dengan Modifikasi Sudut Datang Priambodo, Doni; Sanjaya, Yongky; Sarli, Prasanti Widyasih; Setio, Herlien Dwiarti
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 2 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v28i2.37220

Abstract

In fluid dynamics analysis, one of the things to do is to perform numerical modeling validated on the resultsof experimentation. In numerical modeling of wind flow there are several forms of modeling used includingRANS, LES, DNS, etc. where the modeling has its own advantages and disadvantages. Among these models,RANS is a model that has the cheapest computer expense compared to other models so that it has the highestworkability. Therefore, rans method testing (Reynolds Averaged Navier Stokes) was conducted to determinethe capability of turbulence models in checking wind speed contours on the road between 4 simplesymmetrical tall buildings with 0o, 30o, and 45o attack an gles validated with the results ofexperimentation. This research was conducted using RANS modeling (Reynolds Averaged Navier Stokes) andstandard turbulence model k-ε and validated using Low Speed Wind Tunnel and PIV (Particle ImageVelocimetry). According to the results of the test, U/Uo wind speed conditions obtained in wind modelingwith RANS and k-ε standards have errors that are still acceptable.
Co-Authors Andriana, Cecilia Chen, Pei-ching Doni Priambodo Nurdhyanti, Dinda Imas Sangriyadi Setio, Sangriyadi Sanjaya, Yongky Sarli, Prasanti Widyasih Sinjaya, Michael Felix Syariefatunnisa, Syariefatunnisa